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Linear Technology Electronic Components Datasheet

LT1568 Datasheet

Filter Building Block

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LT1568
FEATURES
Very Low Noise,
High Frequency Active RC,
Filter Building Block
DESCRIPTIO
s Up to 10MHz Center Frequency on a Single 3V
Supply
s Easy to Use—A Single Resistor Value Sets Lowpass
Cutoff Frequency (200kHz ≤ ƒC 5MHz), Unequal
Resistor Values Extend Cutoff Frequency Up to
10MHz
s Extremely Flexible—Different Resistor Values
Allow Lowpass Transfer Functions with or Without
Gain (Butterworth, Chebyshev or Custom)
s SNR = 92dB (ƒC = 2MHz, 2VP-P)
s THD = –84dB (ƒC = 2MHz, 1VP-P)
s Internal Capacitors Trimmed to ±0.75%
s Single 4-Pole Lowpass Filter or Matched Pair of
2-Pole Lowpass Filters
s Can be Connected as a Bandpass Filter
s Single-Ended or Differential Output
s Operates from Single 3V (2.7V Min) to ±5V Supply
s Rail-to-Rail InputUand Output Voltages
APPLICATIO S
s Replaces Discrete RC Active Filters and LC Filter
Modules
s Antialiasing/Reconstruction Filters
s Dual or I-and-Q Channels (Two Matched 2nd Order
Filters in One Package)
s Single-Ended to Differential Conversion
s Video Signal Processing
The LT®1568 is an easy-to-use, active-RC filter building
block with rail-to-rail inputs and outputs. The internal ca-
pacitors of the IC and the GBW product of the internal low
noise op amps are trimmed such that consistent and repeat-
able filter responses can be achieved. With a single resis-
tor value, the LT1568 provides a pair of matched 2-pole
Butterworth lowpass filters with unity gain suitable for I/Q
channels.
By using unequal-valued external resistors, the two 2-pole
sections can create different frequency responses or
gains. In addition, the two stages may be cascaded to
create a single 4-pole filter with a programmable re-
sponse. Capable of cutoff frequencies up to 10MHz, the
LT1568 is ideal for antialiasing or channel filtering in high
speed data communications systems. The LT1568 can
also be used as a bandpass filter.
The LT1568 features very low noise, supporting signal-to-
noise ratios of over 90dB. It also provides single-ended to
differential signal conversion for directly driving high
speed A/D converters. The LT1568 has a shutdown mode
that reduces supply current to approximately 0.5mA on a
5V supply.
The LT1568 is available in a narrow 16-lead SSOP
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Amplitude and Phase Matched Dual Butterworth 2.5MHz Lowpass
Filter with Differential Output. Single 3V Supply Operation
3V
511
VINA
VOUTA
VOUTA
0.1µF
511
1
2
V+ LT1568 V+
16
15
INVA INVB
3
SA
14
SB
4 13
OUTA OUTB
5115
12
OUTA OUTB
6
GNDA
0.1µF 7
NC
11
GNDB
10
EN
8 V
V9
511
511
1568 TA01
511
VINB
VOUTB
VOUTB
THE PROPRIETARY ARCHITECTURE
ALLOWS FOR A SIMPLE RESISTOR
CALCULATION:
R = 128• 10ƒMCHz; ƒC = CUTOFF FREQUENCY
Amplitude Response
3
0
–3
–6
–9
–12
–15
–18
–21
–24
–27
100k
1M
FREQUENCY (Hz)
10M
1568 TA02
1568f
1


Linear Technology Electronic Components Datasheet

LT1568 Datasheet

Filter Building Block

No Preview Available !

LT1568
ABSOLUTE AXI U RATI GS
(Note 1)
Total Supply Voltage (V+ to V) ........................... 11.6V
Input Voltage on INVA, INVB, GNDA and
GNDB Pins ....................................................... V+ to V
Input Current on INVA, INVB, GNDA and
GNDB Pins (Note 2) ........................................... ±10mA
Output Short-Circuit Duration on OUTA, OUTB, OUTA
and OUTB Pins ............................................... Indefinite
Maximum Continuous Output Current (Note 3)
DC ............................................................... ±100mA
Specified Temperature Range (Note 9)
LT1568C ............................................ – 40°C to 85°C
LT1568I ............................................. – 40°C to 85°C
Junction Temperature .......................................... 150°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
V+ 1
INVA 2
SA 3
OUTA 4
OUTA 5
GNDA 6
NC 7
V8
TOP VIEW
16 V+
15 INVB
14 SB
13 OUTB
12 OUTB
11 GNDB
10 EN
9 V
GN PACKAGE
16-LEAD PLASTIC SSOP
TJMAX = 150°C, θJA = 135°C/W
ORDER PART
NUMBER
LT1568CGN
LT1568IGN
GN PART
MARKING
1568
1568I
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications and typical values are at TA = 25°C. VS = single 5V, EN pin to logic “low,” RL = 400,
connected to midsupply, RFIL = R11 = R21 = R31 = R12 = R22 = R32, unless otherwise noted (see Block Diagram).
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
VS Total Supply Voltage
IS Supply Current
Shutdown Supply Current
Output Voltage Swing High
(OUTA, OUTA, OUTB, OUTB Pins)
Output Voltage Swing Low
(OUTA, OUTA, OUTB, OUTB Pins)
IOUT Maximum Output Current
Op Amp Input Offset Voltage
Inverter Output Offset Voltage
VS = 3V
VS = 5V
VS = ±5V
VS = 3V, VEN = 2.4V
VS = 5V, VEN = 4.4V
VS = ±5V, VEN = 4.4V
VS = 3V, RFIL = 1.28k, RL = 1k
VS = 5V, RFIL = 1.28k, RL = 1k
VS = 5V, RFIL = 128, RL = 400
VS = ±5V, RFIL = 1.28k, RL = 1k
VS = 3V, RFIL = 1.28k, RL = 1k
VS = 5V, RFIL = 1.28k, RL = 1k
VS = 5V, RFIL = 128, RL = 400
VS = ±5V, RFIL = 1.28k, RL = 1k
VS = 3V
VS = 5V
VS = ±5V
VS = 3V
VS = 5V
VS = ±5V
q 2.7
11
q 24 35
q 26 36
q 28 38
q 0.3 1.0
q 0.5 1.3
q 1.0 2.5
q 2.75
q 4.60
q 4.50
q 4.60
2.85
4.80
4.65
4.75
q 0.05 0.12
q 0.07 0.15
q 0.20 0.40
q –4.7
±80
q –2.5 –0.5
q –2.5
0.2
q –2.0
1.2
1.5
2.5
4.5
q –2
2.5 7.0
q –10
0.6 4.5
q –12 –4.0 2.0
V
mA
mA
mA
mA
mA
mA
V
V
V
V
V
V
V
V
mA
mV
mV
mV
mV
mV
mV
1568f
2


Part Number LT1568
Description Filter Building Block
Maker Linear
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LT1568 Datasheet PDF






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